Repair of spondylolysis using a pedicle screw U-shaped rod construct: A preliminary study of 25 young patients with a mean follow-up of 24 months.

Study Design: Prospective case series, therapeutic Level IV.

Objectives: Functional and radiographic outcome evaluation of patients with spondylolysis treated with pars interarticularis defect repair with iliac bone grafting and application of a construct consisting of a pair of polyaxial pedicle screws connected by a U-shaped rod passing beneath the spinous process.

Methods: Twenty-five patients (27 operated lumbar levels) with an average of 20 months of follow-up (range 12-24 m) with spondylolysis who met our inclusion criteria were treated with the above-mentioned technique.